Ok so I currently have the headunit in my signature. I am buying a used Alpine CDA-9857 for the ipod speed connection and also because my current headunit doesn't have a channel for the subwoofer and the 9857 does.

Will this help with the SQ of my system overall. At the moment I cant adjust my speakers bass without adjusting the subwoofer level, and I was just wondering if this is an overall better headunit in general.